[1]王登科,郭斌.光折变掺铜钾钠铌酸锶钡晶体中双波耦合的信噪比研究 [J].浙江科技大学学报,2008,(01):7. WANG Deng-ke,GUO Bin.Research in SNR of two-wave mixing in photorefractive Cu:KNSBN crystal[J].,2008,(03):7.